Jagged crown Questbug

[frhghz]

I tried to end the quest "jagged crown" but somehow the jarl in the grave doesn't wear the crown on it's head, is this a temporary bug, or something else.

 

I already tried four times, but everytime there is no crown, on 'his' head or his inverntory after killing him.

 

Can somebody help me???

 

Edit: eventried to kill my following stormcloaks, they didn't had it either.